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How is pure alumina obtained from bauxit...

How is pure alumina obtained from bauxite by leaching process.

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` Al_(2)O_(3)+ 2NaOH + 3H_(2)Oto 2Na[Al(OH)_(4)]`
`2NaAl(OH)_(4) +CO_(2) to A1_(2)O_(3), xH_(2)O+ 2NaHCO_(3)`.
`Al_(2)O_(3), xH_(2)tounderset(1470K)(Al_(2)O_(3)+xH_(2)O`
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